Other depictions

In Micro-Series Issue #3, Hayseed Turnip Truck, wearing formal attire, is shown on the cover of the Farmer's Rowdy Weekly Round-Up newsletter in How Rarity Got Her Groovy Back, and he appears in the mini-comic The Trials of Hayseed Turnip Truck wherein he tries to win Rarity's heart and is thwarted by Spike.

Hayseed Turnip Truck is a character in Gameloft's mobile game. The game's description of him states, "Hayseed Turnip Truck enjoys the simple things in life. Loyal and lovesick, this likable livewire is smarter than he seems!"

Merchandise

In the Canterlot Nights expansion set of Enterplay's collectible card game, card #36 U lists Hayseed Turnip Truck's name with a trademark symbol and gives him the description "Hayseed has tried his hoof at many odd jobs. He's not the fastest learner out there, but he doesn't quit until he gets it right."

The Elements of Harmony Vol. II guidebook

HAYSEEED[sic] TURNIP TRUCK is the helper of the family. He's ready to tackle any job he's given, even if he doesn't know how to do it! While he's not the shiniest apple in the bunch, he's got spirit and gusto to spare.

Quotes

"It's me, Hayseed Turnip Truck! We met at the big hoedown in Ponyville last month?"